Malicious PDF — malware analysis report

Static analysis result for SHA-256 74ee4d46c493156c…

MALICIOUS

PDF

39.3 KB Created: 2020-10-31 20:30:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 04573b52d04c0f67147fad312e55dcbf SHA-1: 9ac61700bbfc0a7cf6bd7e1d49eab49be9b29d05 SHA-256: 74ee4d46c493156c39b7f895c63558714422bacb88309e676b7ab6a019bec0c1
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of embedded links, many of which point to external PDF files, suggesting a link farm or SEO manipulation tactic. One prominent link, 'https://ttraff.link/123?keyword=bts+the+most+beautiful+moment+in+life+pt+1+photocards', is identified as a malicious redirector. The document body, though heavily obfuscated, also contains this URL, indicating an attempt to lure users to malicious infrastructure. The ML classifier strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://ttraff.link/123?keyword=bts+the+most+beautiful+moment+in+life+pt+1+photocards
    • https://cdn-cms.f-static.net/uploads/4382953/normal_5f8e4239433eb.pdf
    • https://xeseboda.weebly.com/uploads/1/3/4/3/134323550/1c1062.pdf
    • https://sepikupi.weebly.com/uploads/1/3/0/7/130738949/ropesigele-burevake-likid-renolidisawem.pdf
    • https://cdn-cms.f-static.net/uploads/4366662/normal_5f9071bcc85f4.pdf
    • https://vuvofazomegudej.weebly.com/uploads/1/3/4/3/134329778/372ca3.pdf
    • https://birebojutadavom.weebly.com/uploads/1/3/4/3/134342015/defisore.pdf
    • https://bivogovaxi.weebly.com/uploads/1/3/4/3/134320375/bitosivegekugomi.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0268/8571/8198/files/wizard_of_oz_dolls_madame_alexander.pdf
    • https://s3.amazonaws.com/jobavo/41730359972.pdf
    • https://uploads.strikinglycdn.com/files/03d31334-cb26-4b65-b345-fa0fdc463263/descargar_fireworks_para_mac.pdf
    • https://uploads.strikinglycdn.com/files/98a14655-0e59-4919-a3c0-4cad6c34a8b7/xuxanujalowevolakole.pdf
    • https://cdn.shopify.com/s/files/1/0440/1653/3654/files/fusizu.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000046ed.bin
5312c09cb0934c0d8a91140f43091e5434e4385fa8bb0eba600175d822e9a4e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x46ED 3904 bytes
font_01_sfnt_off000054e8.bin
b7de2851226da37e7cc3e4d0db41153987dcba883a843771f40175ccfd3d6f7a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x54E8 5636 bytes
font_02_sfnt_off000067e6.bin
2cf9aaa6a28c2f5a529af17e85229a5af74fe29f19591902b5a05d2f364f8945		 pdf-font-stream PDF embedded font (sfnt) at offset 0x67E6 12520 bytes

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